Designated as WOAH Reference Laboratory for Brucellosis at 77th WOAH general session in May, 2009.
Dr. Jin-Ju Lee
[Animal and Plant Quarantine Agency]
Bacterial Disease Division
[Animal and Plant Quarantine Agency]
Characterization of betaine aldehyde dehydrogenase (BetB) as an essential virulence factor of Brucella abortus(2015-04-14) | |||||
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Part | 동식물위생연구부 | Charger | 이진주 | date | 2015-04-14 |
Characterization of betaine aldehyde dehydrogenase (BetB) as an essential virulence factor of Brucella abortus. Vet Microbiol. 2014 Jan 10;168(1):131-40 Lee JJ, Kim JH, Kim DG, Kim DH, Simborio HL, Min WG, Rhee MH, Lim JH, Chang HH, Kim S. Abstract The pathogenic mechanisms of Brucellosis used to adapt to the harsh intracellular environment of the host cell are not fully understood. The present study investigated the in vitro and in vivo characteristics of B. abortus betaine aldehyde dehydrogenase (BetB) (Gene Bank ID: 006932) using a betB deletion mutant constructed from virulent B. abortus 544. In test under stress conditions, including osmotic- and acid stress-resistance, the betB mutant had a lower osmotic-resistance than B. abortus wild-type. In addition, the betB mutant showed higher internalization rates compared to the wild-type strain; however, it also displayed replication failures in HeLa cells and RAW 264.7 macrophages. During internalization, compared to the wild-type strain, the betB mutant was more adherent to the host surface and showed enhanced phosphorylation of protein kinases, two processes that promote phagocytic activity, in host cells. During intracellular trafficking, colocalization of B. abortus-containing phagosomes with LAMP-1 was elevated in betB mutant-infected cells compared to the wild-type cells. In mice, the betB mutant was predominantly cleared from spleens compared to the wild-type strain after 2 weeks post-infection, and the vaccination test with the live betB mutant showed effective protection against challenge infection with the virulent wild-type strain. These findings suggested that the B. abortus betB gene substantially affects the phagocytic pathway in human phagocytes and in host cells in mice. Furthermore, this study highlights the potential use of the B. abortus betB mutant as a live vaccine for the control of brucellosis. |
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